Prep for bedliner

[TAC71]

Planning on spraying the bed with a bedliner. Was wondering what others have done in regards to the bed seams. The box is in great shape , no rust , but the seams have small gaps and before I spray the liner I was thinking of cleaning and then sealing the seams before spraying the liner. I'm thinking that sealing before spraying would be the best route.
What have others done with this?

 

[JohnyPython]

I don’t think the seams should be sealed at the front of the box. Mine aren’t and I think that’s for drainage.

 

[TAC71]

I do believe you are correct about the drainage. That doesn't worry me much. Thing I don't like is I find sand and crap stuck in the gap. Which will probably be worse when the box liner fills it in slightly.